Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Month | Chan. | Qual. | # obs. | 518s | 439s | 373s | 316s | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202402 | LHZ-10 | AR | 1 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 202401 | LHZ-10 | AR | 744 | -152 | -156 | -160 | -164 | -167 | -168 | -169 | -170 | -171 | -171 | -172 | -173 | -174 | -175 | -175 | -176 | -176 | -176 | -174 | -171 | -162 | -154 | -153 | -155 | -150 |
| 202312 | LHZ-10 | AR | 699 | -147 | -151 | -152 | -155 | -157 | -158 | -158 | -159 | -160 | -161 | -163 | -163 | -165 | -166 | -166 | -167 | -167 | -166 | -166 | -163 | -162 | -161 | -160 | -160 | -158 |
| 202311 | LHZ-10 | AR | 693 | -129 | -125 | -124 | -133 | -140 | -146 | -149 | -153 | -156 | -158 | -161 | -162 | -164 | -166 | -167 | -168 | -168 | -169 | -169 | -168 | -166 | -164 | -163 | -162 | -156 |
| 202310 | LHZ-10 | AR | 562 | -178 | -179 | -179 | -179 | -179 | -179 | -178 | -177 | -176 | -175 | -174 | -173 | -172 | -171 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -160 |
| 202309 | LHZ-10 | AR | 720 | -179 | -179 | -180 | -180 | -180 | -179 | -178 | -178 | -176 | -175 | -174 | -173 | -172 | -171 | -169 | -169 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -161 | -160 |
| 202308 | LHZ-10 | AR | 602 | -176 | -178 | -178 | -179 | -178 | -178 | -177 | -176 | -175 | -174 | -173 | -172 | -171 | -170 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 |
| 202307 | LHZ-10 | AR | 744 | -120 | -119 | -114 | -88 | -109 | -127 | -129 | -115 | -123 | -132 | -106 | -117 | -116 | -121 | -118 | -123 | -124 | -126 | -128 | -130 | -132 | -133 | -135 | -136 | -137 |
| 202306 | LHZ-10 | AR | 720 | -117 | -114 | -110 | -90 | -106 | -122 | -126 | -116 | -112 | -127 | -111 | -119 | -113 | -122 | -121 | -122 | -124 | -126 | -127 | -129 | -130 | -132 | -133 | -134 | -136 |
| 202305 | LHZ-10 | AR | 704 | -143 | -147 | -151 | -154 | -156 | -159 | -161 | -163 | -165 | -167 | -169 | -171 | -172 | -173 | -175 | -176 | -176 | -176 | -176 | -172 | -164 | -157 | -156 | -158 | -145 |
| 202304 | LHZ-10 | AR | 349 | -152 | -157 | -162 | -167 | -171 | -174 | -176 | -179 | -179 | -180 | -181 | -181 | -183 | -183 | -183 | -183 | -182 | -181 | -178 | -175 | -167 | -159 | -157 | -159 | -158 |
| 202303 | LHZ-10 | AR | 743 | -152 | -155 | -161 | -166 | -171 | -175 | -177 | -178 | -180 | -180 | -181 | -182 | -182 | -183 | -183 | -183 | -182 | -180 | -178 | -174 | -165 | -157 | -154 | -157 | -156 |
| 202302 | LHZ-10 | AR | 666 | -149 | -153 | -157 | -162 | -167 | -171 | -174 | -177 | -178 | -179 | -180 | -181 | -181 | -182 | -182 | -181 | -180 | -179 | -176 | -170 | -160 | -153 | -153 | -155 | -147 |
| 202301 | LHZ-10 | AR | 742 | -152 | -156 | -159 | -164 | -168 | -172 | -174 | -176 | -177 | -177 | -179 | -180 | -180 | -181 | -181 | -180 | -180 | -178 | -175 | -169 | -161 | -153 | -152 | -153 | -145 |
| 202212 | LHZ-10 | AR | 741 | -151 | -155 | -160 | -164 | -168 | -169 | -171 | -174 | -175 | -176 | -177 | -179 | -180 | -180 | -181 | -181 | -180 | -179 | -177 | -171 | -161 | -154 | -153 | -155 | -151 |
| 202211 | LHZ-10 | AR | 718 | -150 | -154 | -158 | -163 | -167 | -170 | -173 | -175 | -176 | -176 | -177 | -179 | -179 | -180 | -180 | -180 | -180 | -179 | -176 | -171 | -163 | -155 | -154 | -155 | -149 |
| 202210 | LHZ-10 | AR | 728 | -154 | -158 | -162 | -165 | -169 | -171 | -173 | -175 | -176 | -177 | -177 | -178 | -179 | -180 | -180 | -180 | -180 | -179 | -177 | -172 | -163 | -156 | -155 | -158 | -150 |
| 202209 | LHZ-10 | AR | 661 | -152 | -158 | -162 | -167 | -171 | -174 | -175 | -177 | -177 | -178 | -178 | -179 | -180 | -180 | -180 | -179 | -178 | -177 | -175 | -169 | -160 | -154 | -154 | -157 | -148 |
| 202208 | LHZ-10 | AR | 689 | -119 | -117 | -114 | -109 | -114 | -122 | -126 | -122 | -119 | -132 | -123 | -125 | -127 | -127 | -130 | -132 | -135 | -137 | -140 | -141 | -143 | -144 | -145 | -147 | -147 |
| 202207 | LHZ-10 | AR | 744 | -113 | -111 | -105 | -68 | -112 | -121 | -121 | -107 | -126 | -128 | -114 | -111 | -113 | -114 | -117 | -121 | -122 | -126 | -128 | -131 | -133 | -135 | -137 | -138 | -137 |
| 202206 | LHZ-10 | AR | 719 | -113 | -109 | -83 | -69 | -119 | -128 | -122 | -102 | -141 | -121 | -131 | -125 | -134 | -137 | -138 | -142 | -144 | -147 | -149 | -151 | -152 | -150 | -151 | -150 | -141 |
| 202205 | LHZ-10 | AR | 743 | -121 | -112 | -74 | -113 | -131 | -138 | -125 | -134 | -141 | -133 | -146 | -149 | -152 | -154 | -158 | -159 | -160 | -161 | -162 | -163 | -164 | -160 | -161 | -159 | -150 |
| 202204 | LHZ-10 | AR | 720 | -119 | -117 | -112 | -87 | -117 | -129 | -134 | -132 | -139 | -144 | -138 | -138 | -135 | -142 | -146 | -147 | -152 | -154 | -154 | -154 | -157 | -157 | -159 | -158 | -150 |
| 202203 | LHZ-10 | AR | 738 | -148 | -153 | -159 | -164 | -169 | -175 | -179 | -183 | -185 | -188 | -190 | -191 | -192 | -194 | -194 | -193 | -193 | -191 | -188 | -184 | -175 | -170 | -169 | -172 | -167 |
| 202202 | LHZ-10 | AR | 573 | -172 | -172 | -176 | -176 | -178 | -178 | -182 | -185 | -187 | -189 | -191 | -193 | -194 | -195 | -195 | -195 | -194 | -192 | -189 | -182 | -172 | -168 | -168 | -171 | -159 |
| 202009 | LHZ-10 | AR | 379 | -175 | -175 | -176 | -177 | -178 | -177 | -177 | -177 | -177 | -178 | -178 | -178 | -179 | -179 | -180 | -179 | -179 | -178 | -176 | -170 | -162 | -156 | -156 | -159 | -151 |
| 202008 | LHZ-10 | AR | 679 | -176 | -176 | -177 | -178 | -179 | -178 | -178 | -179 | -178 | -179 | -179 | -180 | -181 | -180 | -181 | -181 | -180 | -179 | -177 | -173 | -165 | -159 | -158 | -162 | -156 |
| 202007 | LHZ-10 | AR | 707 | -176 | -177 | -178 | -178 | -178 | -178 | -178 | -178 | -178 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -177 | -173 | -165 | -159 | -159 | -162 | -156 |
| 202006 | LHZ-10 | AR | 719 | -153 | -172 | -180 | -180 | -160 | -166 | -177 | -166 | -176 | -176 | -176 | -176 | -177 | -176 | -177 | -179 | -177 | -178 | -176 | -171 | -162 | -155 | -155 | -160 | -151 |
| 202005 | LHZ-10 | AR | 733 | -176 | -178 | -171 | -166 | -179 | -163 | -176 | -164 | -171 | -177 | -177 | -177 | -174 | -179 | -179 | -179 | -178 | -179 | -177 | -173 | -164 | -157 | -156 | -157 | -155 |
| 202004 | LHZ-10 | AR | 710 | -177 | -179 | -179 | -180 | -181 | -179 | -180 | -179 | -179 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -180 | -180 | -178 | -174 | -164 | -156 | -155 | -158 | -154 |
| 202003 | LHZ-10 | AR | 740 | -178 | -179 | -181 | -183 | -182 | -181 | -181 | -182 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -181 | -180 | -177 | -172 | -164 | -156 | -155 | -158 | -150 |
| 202002 | LHZ-10 | AR | 695 | -179 | -179 | -182 | -183 | -183 | -181 | -182 | -182 | -181 | -180 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -179 | -177 | -171 | -162 | -154 | -153 | -156 | -151 |
| 202001 | LHZ-10 | AR | 736 | -178 | -179 | -181 | -181 | -181 | -181 | -180 | -181 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -175 | -169 | -159 | -153 | -152 | -154 | -148 |
| 201912 | LHZ-10 | AR | 743 | -180 | -179 | -182 | -183 | -183 | -181 | -181 | -181 | -180 | -181 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -177 | -172 | -162 | -154 | -153 | -154 | -149 |
| 201911 | LHZ-10 | AR | 652 | -179 | -178 | -181 | -182 | -183 | -181 | -181 | -182 | -180 | -181 | -181 | -182 | -182 | -183 | -183 | -182 | -182 | -180 | -178 | -173 | -164 | -157 | -154 | -156 | -153 |
| 201910 | LHZ-10 | AR | 619 | -180 | -178 | -182 | -183 | -183 | -181 | -181 | -181 | -181 | -181 | -181 | -181 | -182 | -182 | -183 | -182 | -181 | -180 | -178 | -173 | -163 | -156 | -154 | -156 | -153 |
| 201909 | LHZ-10 | AR | 579 | -180 | -178 | -181 | -182 | -182 | -181 | -181 | -181 | -180 | -180 | -180 | -181 | -182 | -182 | -182 | -181 | -181 | -180 | -177 | -171 | -162 | -156 | -156 | -158 | -156 |
| 201908 | LHZ-10 | AR | 675 | -178 | -178 | -180 | -180 | -181 | -180 | -180 | -180 | -179 | -180 | -180 | -180 | -181 | -181 | -181 | -181 | -181 | -180 | -178 | -174 | -165 | -158 | -157 | -160 | -154 |
| 201907 | LHZ-10 | AR | 739 | -178 | -178 | -180 | -180 | -180 | -180 | -180 | -179 | -179 | -179 | -179 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -176 | -172 | -163 | -156 | -156 | -161 | -156 |
| 201906 | LHZ-10 | AR | 699 | -178 | -178 | -180 | -181 | -181 | -180 | -180 | -180 | -179 | -179 | -180 | -180 | -181 | -181 | -182 | -181 | -181 | -180 | -178 | -173 | -164 | -157 | -157 | -160 | -154 |
| 201905 | LHZ-10 | AR | 743 | -179 | -178 | -181 | -182 | -182 | -180 | -180 | -180 | -179 | -179 | -179 | -180 | -180 | -180 | -181 | -180 | -180 | -179 | -177 | -171 | -162 | -155 | -155 | -159 | -148 |
| 201904 | LHZ-10 | AR | 710 | -179 | -179 | -181 | -183 | -183 | -181 | -181 | -182 | -180 | -181 | -181 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -177 | -173 | -164 | -157 | -155 | -159 | -156 |
| 201903 | LHZ-10 | AR | 741 | -179 | -179 | -182 | -183 | -183 | -181 | -182 | -182 | -181 | -181 | -181 | -181 | -182 | -181 | -182 | -181 | -180 | -179 | -177 | -171 | -161 | -155 | -154 | -157 | -150 |
| 201902 | LHZ-10 | AR | 669 | -176 | -177 | -178 | -179 | -180 | -180 | -181 | -181 | -181 | -180 | -181 | -181 | -182 | -182 | -182 | -181 | -180 | -179 | -176 | -171 | -161 | -155 | -154 | -156 | -149 |
| 201901 | LHZ-10 | AR | 743 | -177 | -178 | -179 | -179 | -180 | -180 | -181 | -180 | -180 | -180 | -180 | -181 | -181 | -181 | -182 | -181 | -180 | -179 | -176 | -171 | -162 | -154 | -154 | -156 | -148 |
| 201812 | LHZ-10 | AR | 743 | -176 | -177 | -178 | -179 | -179 | -179 | -180 | -180 | -179 | -179 | -180 | -180 | -181 | -181 | -181 | -180 | -180 | -178 | -176 | -170 | -162 | -156 | -154 | -153 | -145 |
| 201811 | LHZ-10 | AR | 717 | -176 | -178 | -180 | -180 | -180 | -180 | -181 | -180 | -180 | -180 | -180 | -180 | -181 | -181 | -182 | -181 | -181 | -179 | -177 | -171 | -162 | -156 | -154 | -156 | -154 |
| 201810 | LHZ-10 | AR | 739 | -177 | -178 | -179 | -180 | -180 | -179 | -180 | -180 | -180 | -179 | -179 | -180 | -180 | -180 | -180 | -180 | -179 | -178 | -176 | -171 | -162 | -155 | -154 | -155 | -149 |
| 201809 | LHZ-10 | AR | 718 | -177 | -178 | -179 | -179 | -179 | -179 | -180 | -180 | -179 | -179 | -180 | -180 | -180 | -181 | -181 | -180 | -180 | -178 | -176 | -170 | -162 | -157 | -156 | -158 | -150 |
| 201808 | LHZ-10 | AR | 725 | -178 | -180 | -180 | -181 | -181 | -181 | -181 | -181 | -180 | -180 | -181 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -177 | -173 | -164 | -158 | -158 | -161 | -157 |
| 201807 | LHZ-10 | AR | 741 | -170 | -172 | -174 | -175 | -176 | -177 | -177 | -177 | -178 | -177 | -178 | -179 | -180 | -181 | -181 | -180 | -179 | -179 | -175 | -167 | -159 | -154 | -155 | -157 | -143 |
| 201806 | LHZ-10 | AR | 717 | -117 | -119 | -122 | -124 | -126 | -128 | -130 | -132 | -133 | -134 | -134 | -135 | -134 | -134 | -133 | -132 | -132 | -132 | -131 | -131 | -131 | -130 | -130 | -130 | -129 |
| 201805 | LHZ-10 | AR | 743 | -177 | -178 | -178 | -180 | -180 | -180 | -180 | -180 | -180 | -180 | -180 | -181 | -181 | -181 | -181 | -180 | -179 | -178 | -175 | -171 | -163 | -156 | -157 | -159 | -153 |
| 201804 | LHZ-10 | AR | 720 | -181 | -183 | -183 | -183 | -183 | -182 | -182 | -181 | -181 | -181 | -181 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -178 | -174 | -165 | -157 | -155 | -159 | -155 |
| 201803 | LHZ-10 | AR | 741 | -181 | -182 | -183 | -183 | -183 | -183 | -183 | -183 | -182 | -181 | -181 | -182 | -182 | -183 | -183 | -182 | -181 | -180 | -178 | -173 | -164 | -156 | -155 | -158 | -154 |
| 201802 | LHZ-10 | AR | 667 | -181 | -183 | -183 | -183 | -184 | -184 | -184 | -183 | -183 | -182 | -182 | -183 | -183 | -183 | -183 | -183 | -182 | -180 | -177 | -172 | -164 | -156 | -154 | -158 | -154 |
| 201801 | LHZ-10 | AR | 743 | -182 | -183 | -183 | -183 | -185 | -185 | -184 | -183 | -182 | -182 | -182 | -182 | -183 | -183 | -183 | -182 | -181 | -180 | -176 | -170 | -162 | -154 | -153 | -154 | -150 |